diff options
| author | Vineet Gupta <vgupta@synopsys.com> | 2016-06-28 09:42:25 +0530 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2016-08-22 22:38:22 +0100 |
| commit | 75126cd29c7e3ca321748be507177677f884f466 (patch) | |
| tree | 9caffb4682a518f053cd625130545365c99a7563 /arch | |
| parent | db92ce5d03426443f8e1e82279bbd306bd1b2327 (diff) | |
ARC: unwind: ensure that .debug_frame is generated (vs. .eh_frame)
commit f52e126cc7476196f44f3c313b7d9f0699a881fc upstream.
With recent binutils update to support dwarf CFI pseudo-ops in gas, we
now get .eh_frame vs. .debug_frame. Although the call frame info is
exactly the same in both, the CIE differs, which the current kernel
unwinder can't cope with.
This broke both the kernel unwinder as well as loadable modules (latter
because of a new unhandled relo R_ARC_32_PCREL from .rela.eh_frame in
the module loader)
The ideal solution would be to switch unwinder to .eh_frame.
For now however we can make do by just ensureing .debug_frame is
generated by removing -fasynchronous-unwind-tables
.eh_frame generated with -gdwarf-2 -fasynchronous-unwind-tables
.debug_frame generated with -gdwarf-2
Fixes STAR 9001058196
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arc/Makefile | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/arc/Makefile b/arch/arc/Makefile index 429279bc3028..e8f8b5133d4d 100644 --- a/arch/arc/Makefile +++ b/arch/arc/Makefile @@ -35,8 +35,6 @@ cflags-$(atleast_gcc44) += -fsection-anchors cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape cflags-$(CONFIG_ARC_HAS_RTSC) += -mrtsc -cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables - # By default gcc 4.8 generates dwarf4 which kernel unwinder can't grok ifeq ($(atleast_gcc48),y) cflags-$(CONFIG_ARC_DW2_UNWIND) += -gdwarf-2 |